Acrylic copolymer elastomer and vulcanizable composition containing same

Abstract

There are provided an acrylic copolymer elastomer containing an acrylic acid polyalkylene glycol ester as a constituent, and a vulcanizable composition comprising said elastomer and a vulcanizing agent, which composition gives a vulcanizate excellent in cold resistance, heat resistance and oil resistance. The acrylic copolymer elastomer is obtained by copolymerizing (a) 45 to 89.9% by weight of a monomer represented by the formula ##STR1## wherein R 1 denotes an alkyl group having 1 to 8 carbon atoms, and/or a monomer represented by the formula ##STR2## wherein R 2 denotes an alkylene group having 1 to 8 carbon atoms, and R 3 denotes an alkyl group having 1 to 8 carbon atoms, (b) 10 to 45% by weight of a monomer represented by the formula ##STR3## wherein R 4 denotes a hydrogen atom or a methyl group, R 5 denotes a hydrocarbon group having 1 to 8 carbon atoms, m is an integer of 2 to 10, and n is an integer of 2 to 3, (c) 0.1 to 10% by weight of a crosslinkable monomer, and (d) 0 to 30% by weight of a monoethylenically unsaturated monomer copolymerizable with components (a), (b) and (c).

What we claim is: 
     
       1. An acrylic copolymer elastomer vulcanizable composition comprising: an acrylic copolymer elastomer obtained by copolymerizing (a) 45 to 89.9% by weight of a monomer represented by the formula ##STR7## wherein R 1  denotes an alkyl group having 1 to 8 carbon atoms, and/or a monomer represented by the formula ##STR8## wherein R 2  denotes an alkylene group having 1 to 8 carbon atoms, and R 3  denotes an alkyl group having 1 to 8 carbon atoms,   (b) 10 to 45% by weight of a monomer represented by the formula ##STR9## wherein R 4  denotes a hydrogen atom or a methyl group, R 5  denotes a hydrocarbon group having 1 to 8 carbon atoms, m is an integer of 2 to 10, and n is an integer of 2 to 3,   (c) 0.1 to 10% by weight of a crosslinkable monomer, and   (d) 0 to 30% by weight of a monoethylenically unsaturated monomer copolymerizable with components (a), (b) and (c), said elastomer having Mooney viscosity (ML 1+4 , 100°) of 10 to 100;     a vulcanizing agent; and   a vulcanizing agent auxiliary.   
     
     
       2. A rubber member for use in a seal which is obtained by heat-molding the vulcanizable composition of claim 1. 
     
     
       3. A rubber member for use in a hose which is obtained by heat-molding the vulcanizable composition of claim 1. 
     
     
       4. A rubber member for use in a gasket which is obtained by heat-molding the vulcanizable composition of claim 1. 
     
     
       5. The vulcanizable composition of claim 1, wherein said monomer (b) is present in an amount of 10 to 35% by weight.